Applied Materials Today
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2024
·
IF 7.2
Yilong Song,Kunfeng Li,Wencai Sun,Shuang Zhao,Zhen Zhang,Xiaohua Li,Peng Zhang,Zhicong Gan,Zichun Yang
Aerogel fibers are produced by integrating aerogel nanonetworks with structures possessing large aspect ratios, which provide enhanced thermal insulation, noise attenuation, and pollutant adsorption properties compared to those of bulk aerogels. The conventional method for fabricating aerogel fibers, which involves dynamic spinning, depends on the swift solidification of gels within a coagulation bath. This process inevitably affects the gel's internal three-dimensional network structure after it has assumed a formed state, posing substantial difficulties in regulating the pore structure and mechanical strength of the aerogel fibers. In this research, we present a novel technique for the fabrication of poly(methylsilsesquioxane) aerogel short fibers (PAFs), utilizing an ice template-based static molding process. Directional ice crystals act as "hard templates" to form prismatic structures within the wet gel matrix, whereas the electrostatic repulsion from the "soft template," cetyltrimethylammonium bromide (CTAB), safeguards the fiber structure during its formation. Furthermore, the internal pore structure of the aerogel can be precisely controlled by modulating the aggregation states of CTAB micelles in water, which offers diverse reaction sites for silane hydrolysis. The fibers fabricated using this method exhibit large aspect ratios, low density, high specific surface area, and flexibility, displaying excellent insulation properties, stability at high and low temperatures, and hydrophobicity. They are suitable for use as functional fillers in high-performance wearable fabrics.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7778-7790
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IF 4.682
Zhao Haijia,Qu Jiakang,Li Xianyang,Zhao Zhuqing,Chen Xiang,Xie Hongwei,Yin Huayi
Advanced high-performance functional materials rely on their specific morphological structures designed by template method. However, the current template methods suffer from the complex template-removal process. The molten salts have an ability to dissolve some specific materials and could be easily removed by water. Thus, the molten salts could be employed as a not only solvent but also template. Herein, the Na 2 CO 3 –K 2 CO 3 and NaCl–KCl molten salts were employed as both solvents and templates to synthesize the carbonates (CaCO 3 , BaCO 3 , or SrCO 3 ) with diverse morphologies. And then the carbonates, which are soluble in molten salts and insoluble in water, were added into the high-temperature molten salt to form a homogeneous liquid phase. Subsequently, the molten salts templates can be easily removed in water after solidification. After removing the templates, the carbonates with fine particles and strip-shaped belts could be obtained in Na 2 CO 3 –K 2 CO 3 and NaCl–KCl molten salt, respectively, indicating that the different molten salts have diverse template effects. Overall, molten salts are a promising soft and water-soluble template for materials’ structural design.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2024
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IF 2.5
Qin Yangjie,Wang Zhaobo,Jiang Shanzhu,Chi Ruan,Huang Shengchao,Ma Huijuan,Li Zhongjun
Spherical hydroxyapatite (SHAP) has been widely concerned because of its non-toxicity, biocompatibility and unique adsorption capacity. We optimized the synthesis of SHAP using spherical calcium carbonate (CaCO 3 ) as a template to provide reference for its efficient preparation and application. The optimal synthesis conditions of CaCO 3 are initial salt concentration 0.4 M, PVP concentration 1.0 g/L, stirring 60 min with 700 rpm under 35 °C. Under the optimal conditions, the SEM morphology of SHAP is characterized by spherical particles of uneven surface with a uniform particle size distribution (7.402 μm, D 50 ), porous characteristics and large specific surface area (55.85 m 2 /g). In addition, SHAP has a high degree of matching with JCPDS no. 09-0432, has a good HAP crystal form, and has high crystal purity. The microstructure and uniform size of SHAP are the basis of its excellent performance, and the above performance parameters of the products in this study are comparable to or even better than some natural HAP and HAP synthesized using different strategies.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 47
·475708
·
IF 3.874
Qiu-Ping He,Yun Zou,Peng-Fei Wang,Xiao-ming Dou
Silicalite-1 zeolitic membranes have been successfully fabricated on the porous α-Al2O3 support by templated and template-free protocol, respectively, for vapor permeation separation of dichlorobenzene (DCB) isomers. After proving the high quality of the membranes by single gas permeation (He and SF6) performance, the vapor-permeation of DCB isomers over two types of the silicalite-1 membrane was then investigated. The separation results clearly indicated that under the lower partial pressure and higher temperature, the effect of DCB isomer adsorption on the permeance could be kept at a sufficiently low level and sharp selectivity become more important. Thus, high p-DCB selectivity could be achieved. Comparatively, the template-free silicalite-1 zeolite has a much higher p-DCB selectivity due to the relatively fewer inter-crystalline gaps. Under certain separation conditions, the highest selectivity of p-DCB for p-/m-DCB and p-/o-DCB binary systems could reach 165 and 113, respectively.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ANALYTICAL LETTERS
·
2017
·
IF 1.15
Xiuping He,Jiangtao Wang,Xiaoqi Mei
A multitemplate molecularly imprinted polymer was synthesized using fragments similar to gonyautoxins 1 and 4 including 2,4,6-triaminopyrimidine, 4-hydroxy-2-butanone, and imidazole as dummy templates by bulk polymerization. Scanning electron microscopy and infrared spectroscopy showed a porous structure and the formation of organic groups in the imprinting process of the polymer. One millilitre of 0.1 mol L−1 acetic acid and 1 mL of 95% methanol were the optimized washing and eluting solutions during the molecularly imprinted solid-phase extraction. The adsorption capacity of the multitemplate molecularly imprinted polymer was lower than for the monotemplate molecularly imprinted polymer prepared in a previous study in seawater in which Alexandrium tamarense and Alexandrium minutum were cultivated. This result may due to the inappropriate combination of the dummy template fragments in the synthesis resulting in the unfitness of the imprinting sites for gonyautoxins 1 and 4. In general, it is inappropriate to use fragments with the similar parts to the analyte as the dummy templates. However, this work indicated the optimal molecularly imprinted polymer for the selective extraction of gonyautoxins 1 and 4.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2015
·Vol. 407
·期 24
·7401-7412
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IF 3.436
Sun Guang-Ying,Zhong Dan-Dan,Li Xiang-Jie,Luo Yu-Qing,Ba Hang,Liu Zhao-Sheng,Aisa Haji Akber
One of the main challenges in the preparation of molecularly imprinted polymers (MIPs) is the substantial initial amount of template needed because of the requirement of high load capacities for most applications. A new strategy of macromolecular crowding was suggested to solve this problem by reducing the amount of template in the polymerization recipe. In a ternary porogenic system of polystyrene (PS) (crowding agent), tetrahydrofuran, and toluene, an imprinted monolithic column with high porosity and good permeability was synthesized using a mixture of ellagic acid (template), acrylamide, and ethylene glycol dimethacrylate. The effect of polymerization factors, including monomer–template molar ratio and the molecular weight and concentration of PS, on the imprinting effect of the resulting MIP monoliths was systematically investigated. At a high ratio of monomer–template (120:1), the greatest imprinting factor of 32.4 was obtained on the MIP monolith with the aid of macromolecular crowding agent. The PS-based imprinted monolith had imprinting even at the extremely high ratio of functional monomer to template of 1510:1. Furthermore, an off-line solid-phase extraction based on the ground MIP was conducted, and the purification recovery of ellagic acid from pomegranate-rind extract was up to 80 %. In conclusion, this approach based on macromolecular crowding is simple, and is especially valuable for those applications of MIP preparation for which a rare template is used.
研究领域:
分析化学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 61
·期 4
·346-354
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IF 3.046
Die Li,Mei Hong,Yan Wang,Chunyang Bao,Xiaoling Xu,Jing Chen,Bin Peng,Jingyu Zhang,Bingyu Wang,Qiang Zhang
Porous carbon nanospheres have attracted extensive attention due to their excellent advantages in specific surface area, pore distribution, and electronic conductivity. Herein, boron-doped hollow carbon nanospheres with mesoporous walls have been successfully synthesized via a combination of hard/soft templating and boronic acid/sugar ligation. Surface-initiated Cu(0) mediated reversible deactivation radical polymerization was used to initiate the polymerization of 2-hydroxyethyl acrylate and poly(ethylene glycol) methyl ether acrylate from the surface of silica. 4-carboxy-3-fluorophenylboronic acid was introduced as a boron precursor by N -(3-dimethylaminopropyl)- N ′-ethylcarbodiimide hydrochloride coupling and fructose was introduced as a carbon precursor by boronic esters. After carbonization and template etching, boron-doped porous carbon spheres could be obtained. We believe such in-situ heteroatom-doped method has great potential in preparing hollow mesoporous carbon nanospheres with excellent properties. Graphical
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 3
·309-312
·
IF 0.975
Lihui Zhang,Suzhen Bai,Hongpeng You,Huatao Wu,Qinlong Peng,Weili Li,Kesheng Cao,Yanbiao Zhou
Submicrometre-sized EuPO 4 hollow spheres were synthesised by utilising the colloidal spheres of Eu(OH)CO 3 as the sacrificial template, for the first time. The EuPO 4 hollow spheres were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and photoluminescence, respectively. The EuPO 4 hollow spheres exhibit red colour emission from 5 D 0 – 7 F J ( J = 1, 2, 3, 4) transitions of the Eu 3+ ions. The obtained EuPO 4 hollow spheres may have potential applications in cell biology, drug release, diagnosis, due to the high chemistry stability and luminescence function.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Feng Jiang,Lin Qi,Guojun Song,Hua-Zhong Yu
The template-controlled electrodeposition has been widely used for fabricating arrayed micro-/nanostructures (both metallic and composite), which typically requires the vacuum-deposition of a conductive metal film on the template and faces the challenge of detaching them from the substrate electrode for subsequent characterization/application. Herein we report that such a template-assisted fabrication strategy can be readily accomplished by using double-sided carbon tapes in conjunction with nanoporous templates of choice, which allows for not only simple, rapid assembly with any substrate electrode for the deposition of arrayed micro-/nanostructures with standard electrochemical equipment, but also their effort-less detachment for subsequent characterization and application. As of the proof-of-concept, we have demonstrated that “hemisphere” gold ultramicroelectrode arrays with characteristic redox responses can be reproducibly prepared in a few minutes with appropriate deposition time and potential. The application of this convenient method as a routine, benchtop protocol for preparing different types of arrayed micro-/nanostructures (e.g., Au, Cu, and Pt) using various nanoporous templates (both polycarbonate membranes and anodic aluminum oxide substrates) via conventional electrochemical deposition has been also described.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 7
·3801-3807
·
IF 7.443
Lianyi Xu,Dandan Zhu,Xuemin Lu,Qinghua Lu
By mimicking nature, the preparation of artificial self-cleaning surfaces has gradually matured both in theory and technology, but their actual application has been hampered by enormous difficulties. The main challenge is that their design principle (i.e., their requirement for micro- and nano-structures) is difficult to reconcile with the need for coating strength and transparency. Here, we have exploited a porous structured silica coating with the help of an electrodeposited porous PEDOT template. This porous silica coating not only provides the requisite roughness for the final superhydrophobic surface, but also has a low refractive index, thereby enhancing the transparency of the silica coating. After fluorination, a highly transparent, thermally and mechanically stable superhydrophobic coating was obtained. The silica coating is found to withstand tests of harsh environments, such as mechanical resistance and ultra-high hydraulic pressure tests. This large-area superhydrophobic coating has great potential for use in solar cells and self-cleaning windows.
研究领域:
材料科学
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表面工程
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纳米技术
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电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinsong Shi,Jianguo Xu,Hongmin Cui,Nanfu Yan,Runhan Yan,Yaqing Weng
Porous carbon is a very promising type of CO 2 adsorbent due to its excellent stability, low cost, and tunable physicochemical properties. In the current work, N-doped hierarchically porous carbon was synthesized with the assistance of NaCl template and KHCO 3 activation. A series of carbons with three dimensional and interconnected micro- meso -macroporous structure were successfully prepared. Effects of synthesis conditions on textural properties and N-doping were analyzed and discussed with details. The carbons also exhibited high surface area (725–2423 m 2 /g) and N content (1.49–7.93 wt%). CO 2 adsorption properties were studied with a combined experimental and theoretical approach. At 25 °C and 1 bar, the carbons exhibited CO 2 uptake up to 4.22 mmol/g and CO 2 /N 2 selectivity up to 25.6. Grand canonical Monte Carlo (GCMC) simulation was employed to further elucidate the different roles played by N-doping and textural properties during CO 2 adsorption. Effects of various N-functionalities located in pores with different sizes on CO 2 adsorption were thus revealed. The present study presents a novel strategy for controlled synthesis of porous carbons, and provides helpful insights into their CO 2 adsorption behaviors.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Microfluidics and Nanofluidics
·
2015
·Vol. 19
·期 4
·829-836
·
IF 2.528
He Weiqi,Xiao Jingrong,Zhang Zhengtao,Zhang Weiying,Cao Yiping,He Rongxiang,Chen Yong
A cost-effective method that used electroplating to fabricate a 3D polydimethylsiloxane (PDMS) passive micromixer was developed in this work. The mixer fabrication process characteristics were as follows: The chip design was transferred to indium tin oxide (ITO) glass via photolithography; the ITO glass was vertically immersed in a nickel electroplating solution; and the ITO glass was raised up by controlling by the syringe pump, while electroplating was in progress. In this method, the height of the mixing structure could increase gradient from 15 to 30 μm. Compared with a flat structure, this structure could increase mixing efficiency by at least 10 %. The mixing efficiency with this 3D microstructure can reach more than 80 %. This 3D microstructure fabrication method can be easily integrated with other PDMS functional structures for future point-of-care diagnostic applications because of the advantages of this technique.
研究领域:
微流控技术
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）